With over 85 million records sold, Shania Twain is the best-selling female artist in the history of country music. Her 1997 album, Come on Over, is still the best-selling country album of all time, in fact. And now, after 15 years, the "Queen of Country Pop" is proving she's still the one by releasing a new album, due in September, with a single slated for June.

But you might not recognize her darker, deeper sound. Twain revealed in 2011 that she was diagnosed with dysphonia, a disorder of the vocal chords characterized by hoarseness and difficulty speaking—part of the reason for her silence these past 15 years.

Of course, she hasn't been completely quiet: Through voice therapy, Twain recovered and rocked her 2012 Las Vegas show, Shania: Still the One, and her 2015 arena tour. But "I'm a different singer now," she said in an interview with Rolling Stone. "There was a lot of coming to terms with that. It's been one of the obstacles in my life I've just had to learn to live with."

The comeback album, still untitled, will delve into her struggles with her 2010 divorce from husband Robert "Mutt" Lange, who fell in love with Twain's friend, Marie-Anne Thiébaud, and Twain's subsequent marriage to Thiébaud's husband, Frederic. The stress of divorce is what Twain believes led to her dysphonia, and it's what inspired the new songs, which are "quite melancholy and a lot darker," she says.

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One song, for example, called "Who's Gonna Be Your Girl?" is "about feeling unappreciated and knowing that you are secondary," she says. "Having to live with someone that has different priorities and accepting that you're not the most important thing in a person's life."

Writing is like therapy for Twain, and she plans to keep doing it. She told Rolling Stone that instead of touring following her new album's upcoming release, she's going to focus on yet another album. We can only hope this means we won't have to wait so long for new Shania Twain music next time.